Centrifuge Separator Tender: Tends centrifuge separator that purifies used coolant oils from rolling mill machines: Opens valves and starts pumps to transfer oil from machine pit tanks to holding tank. Pulls control levers to add specific amounts of sulfuric acid and water to oil. Opens valves to allow mixture to flow through centrifuge and back to pit tanks of machine. Orders supplies of oil and acid from storeroom and keeps records of solutions used. Delivers samples of purified oil to laboratory. Replaces filters in centrifuge and cleans centrifuge disks, using wire brush and rags.